Pipe reamer and mill



PIPE: REAMER AND MILL.

YFiled April 29, 1955 nien United States Patent PIPE REAMER AND MILLElmo L. Condra, Long Beach, Calif. Application April 29, 1955, SerialNo. 504,891

10 Claims. (Cl. 164-0.8)

This invention relates to a pipe rearner and mill which is usedV in oil,gas or water wells for the purpose of severing pipe which may be in thewell, or for the purpose of cutting what is termed a window in the pipeif it is necessary to by-pass or deflect the hole for any reason. Mytool may also be used as a router or a means of completely pulverizing asection of pipe after lthat section has been severed from the mainportion of the pipe.

An object of my invention is to provide a novel pipe reamer and millwhich can be easily inserted in the pipe and the cutters of which can bereadily moved into engagement with the pipe for the purpose of cuttingor reaming the same.

Another object of my invention is to provide a novel pipe reamer andmill in which the cutters are pressed against the inside of the pipe bymeans of a block which is pressed against the pipe on the side oppositethe cutters.

Another object of my invention is to provide a novel pipe reamer andmill in which the activating block is pressed against'the inside of thepipe by means of fluid pressure. of the well by means of thev usualslush pump.

Still another object of my invention is to'provide a novel pipe reamerand mill in which the activating block which presses the cutters againstthe pipe is urged outwardly by being caused to move upwardly on aninclined n showingrthe cutters in position of completely severing thepipe.

Figure 3 is a sectional view taken on line 3 3 of Figure 1. n o A i o YFigure l'is a sectional view taken Yon line 4 4 of Figure 2.

Referring more particularly to the drawing, the nurneral 1 indicates thepipe or casing, and it is this pipe which is to be cut or severed inorder that the casing or pipe might be removed from the well, or that a`section thereof mightV be completely pulverized or t gound `up Iforfthe`purpose of Vdrilling through the pipe at an angle to the center line ofthe casing, or for other purposes. My pipe reamer and mill is operatedon drill pipe 2, all of which is usual and well known in the art.

The pipe reamer and mill consists of a coupling 3 which is threaded asshown at 4 to receive the threaded connection of the drill pipe 2. Afitting 5 is threaded This fluid pressure is exerted from the surfacefice into the coupling 3 and the purpose of this iitting will be furtherdescribed. A pipe section 6 is threadedonto the lower end of the fitting5 and this pipe section forms a cylinder for the fluid actuatedmechanism, as Will be further described. A mandrel 7 is threaded ontothe lower end of the pipe or cylinder 6, and this mandrel has cutting orreaming teeth 8 projecting from one side thereof. An opening or window 9is provided through the wall of the mandrel 7 on the side opposite theteeth S. An activating block 10 is positioned within the mandrel 7 andis adapted to move vertically Within the mandrel and to be projectedthrough the window 9. The block 10 is slidably mounted on a n inclinedrod 11 and this rod is fixedly attached within the mandrel 7 so that theblock 10 will be moved outwardly through the window 9 as the block movesupwardly on this rod.

A piston 12 is mounted within the cylinder 6 and moves upwardly in thiscylinder` under fluid pressure, as will be further described. A tube 13rises from the piston 12 and extends through the fitting 5. Suitablepacking 14 in the fitting S surrounds the tube 13 and prevents fluidfrom leaking around the outside of this tube. A plurality of outletports 15 are provided in the piston and the ports communicate with thetube 13. Thus fluid under pressure from the drill pipe 2 can iiowdownwardly through the tube 13 and out through the ports 1S to expandthe cup 16 of the piston, and thus exert its pressure below the piston.A restricted orifice 17 at the upper end of the mandrel 7 restricts thetlow of fluid therethrough, creating an upward pressure in the cylinder6 and below the piston 12, thus urging the piston upwardly in thecylinder. A cable or other iiexible connection 18 is attached at one endto the block .itl and at the other end to the piston 12. This cableextends through the orifice or port 17 thus further restricting thisorice. A fluid outlet hole 19 is provided -in the bottom of the mandrel7 so that circulating fluid can pass out of the tool at this point. Ableed holeV 2i) is provided in the fitting 5 so that any fluid whichmight accumulate above the piston 12 can readily surge in l and out ofthe space above the piston without hindering the movement thereof. Y

In operation my pipe reamer and mill is lowered into the casing 1 to thepoint desired. When this point is reached fluid from the slush pump isforced into the drill pipe 2 and this fluid passes downwardly throughthe drill pipe, thence through the tube 13 out through the ports 15 andis restricted in its further downward flow by the orifice 17. Therestriction at 17 thus creates an upward pressure against the bottom ofthe piston 12 urging the piston upwardly in the cylinder 6. An upwardpull on the cable 18 now moves the block 10 upwardly on the inclined rod11. The block 10 moves out through the window 9 and presses against theinside of the casing l, thus pressing the cutters 8 on the opposite sideof the mandrel 7 against the inside of the casing 1. Rota* tion of thedrill pipe 2 will now cause the cutters S to cut or sever the casing 1.A continued upward pressure is exerted on the block 1i), thuscontinuously pressing the cutters 8 into the casing 1 until the casingis entirely severed. The amount of pressure which is Y exerted on theteeth 8 to press them against the casing 1 can be changed as required bychanging the iluid pressure of the slush pump.

Having described my invention, I claim:

1. A pipe rearner and mill comprising a coupling adapted to be attachedto a drill pipe, a cylinder below the coupling, means connecting thecylinder and the coupling, a piston in said cylinder, a tube rising fromthe piston and extending through said means, said tube being open at thetop and the bottom thereof, the bottom open ing below the piston, amandrel attached to the cylinder,

cutters onmone side ofthe mandrel, a block, said mandrel having a windowtherein through which 'said block may move, means mounting said block onthe mandrel for vertical and lateralmovement in said window, and meansconnecting said rblock and the piston. p

2. kA pipe reamer and 'mill comprisingy a coupling adapted to beattached to a drill pipe, a cylinder below .the coupling,meansconnecting the cylinder and the -coupling, a piston in saidcylinder, a tube risingfrom the piston and extending'through said means,said tube being open at the top and the bottom thereof, the bottomopening below the piston, a mandrel, attached to the cylinder, cutterson one side of the mandrel, a block, said mandrel havingva windowtherein through which said block may move, means mounting said block onthe mandrel for vertical and lateral movementin said window, and meansconnecting said blockand the piston, and a restricting oritice in thelower Vpart of the cylinder, lsaid oriiice being below the piston.

3. A -pipe reamer and mill comprising a coupling adapted to be attachedto a drill pipe, a cylinder below the coupling, means connecting thecylinder and the coupling, a piston in said cylinder, a tube rising fromthe piston and extending through said means, said tube being ropen atthe top and the bottom thereof, the bottom opening below the piston, amandrel, attached to the cylinder, cutters on one side of the mandrel, ablock, said mandrel having a window therein through which said block maymove., an inclined rod positioned within the mandrel, said block beingslidably mounted on the rod for vertical and lateral movement in saidwindow, and means connecting said block and thepiston.

4. A pipe reamer and mill comprising a coupling adapted to be attachedto a drill pipe, a cylinder below the coupling, means connecting thecylinder and the coupling, a piston in said cylinder, a tube rising fromthe piston and extending through said means, said tube being open at thetop and the bottom thereof, the bottom opening below the piston, amandrel attached to the cylinder, cutters on one side of the -mandrel, ablock, said mandrel-having a window therein through which said block maymove, means mounting said block on the mandrel r`for vertical andVlateral movement in said window, a cable attached at oneend to theblock and at vthe other end to the piston.

5. A pipe reamer and mill comprising a coupling.

adapted to be'attached to a drill pipe, a cylinder below the coupling,means connecting the cylinder and thecoupling, va piston in saidcylinder, a tube vrising from thepiston and extending through saidmeans, said tube being open at the top and the bottom thereof, thebottom opening below the piston, a mandrel attached to the cylinder,cutters on one side of the mandrel, a block, said mandrel having awindow therein through 'which said yblock 'may move, an inclined `rodpositioned within the mandrel, said block being slidably mounted on therod for vertical and lateral movement in said window, and meansconnecting said block and the piston, and a restricting oriice inthelower part of the cylinder, said orice being below the piston.

6. A pipe reamer and mill comprising a coupling adapted to be attachedto a drill pipe, a cylinder below the coupling, means connecting thecylinder andthe coupling, a piston in said cylinder, a tube rising fromthe piston and extending through'said means, said tube'being open 'atthe top and the bottom thereof, the bottom opening below the piston, amandrel attached to the cylinder, cutters `on one side of the mandrel, ablock, said mandrel having a window therein through which said Ablock'may move, means mounting said block on the 'mandrel for 4 vertical andlateral movement in said window, a cable lattached at 'one to 'the block'and at the 'other e'nd t'o` the piston, and a restricting'oritice inthe lower part of the cylinder, said oriiice being below the piston.

7. A pipe reamer and mill comprising a coupling adapted to be attachedto drill pipe, a cylinder below the coupling, a itting connecting thecylinder and the coupling, a piston in said cylinder, a tube rising fromthe piston and extendingnthrough said .fitting packing means in thefitting around the tube, said tube being open at the top and bottomthereof, the `bottom opening being below the piston, a mandrel below and.attached to said cylinder, cutters on one side of the mandrel, a block,said mandrel having a window 'therein through which said block may move,means mounting said block in the mandrel for vertical and lateralmovement in said window, and means connecting said block and the piston.

8. A pipe reamer and mill comprising a coupling adapted to be attachedto drill pipe, a cylinder below the coupling, a titting connecting vthecylinder and the coupling, -a piston in said cylinder, a tube risingfrom the piston V,and extending through said fitting, packing means inthe iitting around `the tube, said tube being open at the top and.bottom thereof, the .bottom opening being below the piston, a mandrelbelow and attached to said cylinder, cutters on one side of the mandrel,a block, said mandrel having a window therein through which said blockmay move, an inclined rod in the mandrel, said block being slidable onthe rod for lvertical and lateral movement in said window, and meansconnecting said block and the piston.

9. A pipe reamer and mill comprising a coupling adapted to b efattachedtoldrill pipe, a cylinder below the coupling, a fitting connecting thecylinder andthe coupling, a -piston 'in .said cylinder, a tube risingfrom the piston and extending through said tting, packing means in thefitting around thetube, said tube .being openat the top and bottomthereof, the bottom opening being below the piston, a mandrel belowrandattached to said cylinder, cutters on one sidef the mandrel, a block,said mandrel having a vwindow .therein vthrough which said vblock maymove, means mounting said block -in the mandrel for vertical and laterallmovement in said window, and a cable connecting `said lblock and thepiston.

l0. `A pipe reamer and mill comprising a coupling adapted to be attachedto drill pipe, a .cylinder below the coupling, 'a fitting connecting thecylinder and the coupling, a piston in said cylinder, a tube rising fromthe pistonl and extending through said fitting, packing means in ,thefitting around the tube, said tube being open at the top and bottomthereof, the bottom opening being below the piston, a mandrel below and"attached to said cylinder, `cutters on one `side of the mandrel, ablock, said mandrel having a window therein through which said block maymove,'mea ns mounting said block in the mandrel for vertical and lateral.movement in said window, and a cable connecting said block and thepiston, and a restricting orifice in the lower part of the cylinder,said orifice being below the piston.

